Series 2000 (3-cyl.) Engine serial number is stamped on left or right pan rail of block. The engine serial number, stamped into RH ledge or rib behind the bolster, starts with a letter, followed by 6 digits. It is located on a black metal tag on the left side of the tractor, above the front axle. For earlier Ford 5000 Major sold in USA See also: Ford 5000 Major The Ford 5000 tractor and the Ford 5000 Skid Unit were popular with builders of specialist machinery, and specialist application converters. Instant online access to serial number info, paint codes, capacities, weights and more instantly. The 5000 model was the general purpose Ag chassis model within the series, which is also referred to in some of the parts drawings a the '5100', but most folks called it the 5000.